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Citation: ZHANG Xue, GONG Xiaona, ZHU Ruohua. Determination of Naphthlene in Soil Samples by Room Temperature Phosphorescence with Selective Enrichment on α-Cyclodextrin Modified Monolithic Material[J]. Chinese Journal of Applied Chemistry, ;2011, 28(11): 1298-1304. doi: 10.3724/SP.J.1095.2011.00729 shu

Determination of Naphthlene in Soil Samples by Room Temperature Phosphorescence with Selective Enrichment on α-Cyclodextrin Modified Monolithic Material

1.
Department of Chemistry, Capital Normal University, Beijing 100048

Corresponding author: ZHU Ruohua,
Received Date: 9 December 2010
Available Online: 26 February 2011
Fund Project: 国家自然科学基金(20875065)资助项目 (20875065)北京市属市管高校人才强教计划知识创新团队(PHR20100718) (PHR20100718)

The α-cyclodextrin(CD) modified organic monolithic materials were synthesized and applied for the enrichment of polyaromatic compounds from environmental samples. Application of the modified materials in the solid extraction-room temperature phosphores(SPE-RTP) were studied and compared. The room temperature phosphorescence behaviors of 14 organic compounds on the α-CD modified substrate were examined. Compared with the β-CD modified material, the α-CD modified monolithic materials have less RTP background and therefore better sensitivity as well as enrichment capabilities for the double ring aromatic substances. The partition constants of naphthlene and 7,8-benzoquinolin on α-CD modified monolith were found to be 5.03×10³ and 2.94×10², respectively, indicating that α-CD modified monolith has higher selectivity for naphthlene. Naphthol can form inclusion complex also with α-CD modified monolith. However, because of the large polarity and solubility in water, the extraction efficiency at higher concentration is relatively low. The largest enrichment volume for the concentration of 5×10^-11 mol/mL naphthlene is 300 mL. With SPE-RTP, the detection limits for naphthlene and 7,8-benzoquinolin are 9.80×10^-12 mol/mL and 4.60×10^-11 mol/mL, respectively. The linear ranges are 5.00×10^-11~8.00×10^-9 mol/mL and 6.00×10^-11~5.00×10^-10 mol/mL, respectively, with RSD less than 3.7%. α-CD modified membrane was applied to the determination of naphthalene in polluted soil samples and results were further verified by GC-MS. With one step extraction by cyclohexane and then followed by SPE-RTP, naphthlene can be selectively concentrated from soil samples. With 0.012 8 mg naphthlene spiked in the soil samples, the recovery is(104.9 ±6.5)%. The concentration of naphthlene in the soil samples was determined as(5.61 ±0.12) mg/kg, which was in accord with the results of GC-MS.
- organic polymeric monolithic substrate,
- α-cyclodextrin,
- solid phase extraction,
- room temperature phosphorescence,
- polycyclic aromatic hydrocarbon
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